State and explain the law of definite proportions.

Monjur Alahi

State and explain the law of definite proportions.


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Salim Ahmed Kawsar

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Law of definite proportions : 

i. The law states that “A given compound always contains exactly the same proportion of elements by weight”. 

ii. French chemist, Joseph Proust worked with two samples of cupric carbonate; one of which was naturally occurring cupric carbonate and other was synthetic sample. 

He found the composition of elements present in both the samples was same as shown below :

Cupric carbonate % of copper % of carbon % of oxygen
Natural sample 51.35 9.74 38.91
Synthetic sample 51.35 9.74 38.91

iii. Thus, irrespective of the source, a given compound always contains same elements in the same proportion.

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